Cutter bit



Feb. 27, 1951' J. OAKLEY CUTTER BIT Filed Oct. 16, 1948 Fig.1

Patented Feb. 27, 1951 CUTTER BIT John Oakley, Springfield, Mass, assignor to Perkins Machine & Gear Company, West Springfield, Mass, a corporation Application October 16, 1948, Serial No. 54,854

3 Claims.

My invention relates to improvements in the method of and apparatus'for forming drawing rolls as used in the textile industry.

The principal objects of my invention are directed to a method of and an apparatus for forming circumferentially spaced and longitudinally extending alternate grooves and teeth in drawing rolls.

As is well known, drawin rolls are used for various purposes in the textile industry and are generally made of metal and have longitudinal alternate grooves and teeth. As a special requirement, these metal rolls have teeth and grooves, the sides of which are very smooth to obviate fibers adhering there o.

According to common practice, a tool is employed for forming the rolls which has outwardly tapering cutting sides and a cutting point. The roll is moved longitudinally relative to the roll or the tool is moved relative to the roll so that by successive passes, during which light cuts are made, grooves are formed which have inwardly converging sides.

Due to bugs being formed or as light chips ballup, the sides of the grooves are very likely to become rough and a subsequent operation must be performed to provide the grooves with the desired and necessary smooth sides. This obviously adds to the manufacturing costs of the roll.

According to this invention, a tool is provided which is so constructed and arranged that it yields sufiiciently when the point thereof encounters a bug or too heavy a cut so that it passes thereover and continues with the cutting action without burring up of the metal.

Furthermore, since the cutting edge of the tool is on center and the tool in itself is yieldable it is not necessary to receive the tool on the back stroke since the tool point yields outwardly and upwardly away from the work in opposite direction.

Altogether by means of the invention, it is possible to form drawing rolls at low cost which have grooves of the desired characteristics as to fine surface finish.

With the foregoing and various other novel features and advantages and other objects of my invention as will become more apparent as the description proceeds, the invention consists in certain novel features of construction and in the combination and arrangement of parts as will be hereinafter more particularly pointed out in the claims hereunto annexed and more fully described and referred to in connection with the accompanying drawings wherein:

Fig. 1 is a plan view of a drawing roll made in accordance with my invention,

Fig. 2 is a side elevational view of a tool embodving'the novel features of my invention, and

Fig. 3 is a rear elevational view of the tool shown in Fig. 2.

Referring now to the drawings more in detail, the invention will be fully described.

The tool 2 of the invention is shown in Fig. 2 and will be formed from steel of the desired characteristics and will receive such heat treatment as may be desired and necessary in order to provide the most efiicient machining characteristics.

The tool 2 has an upper shank portion, and a lower cutting or working end, as shown.

The working end of the tool is formed with cu ting edges 4 which converge downwardly to a rather narrow point 6.

To use the tool to best advantage the point 6 of the tool is disposed on a center C or on a plane which is vertically disposed at right angles relative to the longitudinal axis of a roll, indicated by R.

The lower part of the cutting end of the tool inclines upwardly and rearwardly from the point 6 as indicated by 8, as shown.

The rear side of the tool is recessed as at it to provide a relatively thin section l2 which is disposed upwardly of the point, as shown, in

Fig. 2 thereby providing a zone of yieldability whereby the cutting portion of the tool may flex slightly while there is sufficient strength in the reduced section to support the point in all normal cutting operations.

It will be assumed that the roll, R in Fig. 1 is -moved longitudinally relative to the tool or in the direction of arrow :1 for a cutting operation for forming groovesG and in the direction of arrow i) for its non-cutting operation or back stroke. In this case the tool will be held bya suitable holder and the roll will be reciprocat'ed 'by some suitable means.

the tool encounter a bug in the groove, which bug will be relatively small, the cutting end of the tool flexes to the right away from the work by reason of the flexible section 12. That is, the point 6 of the tool tends to swing counterclockwise and outwardly and upwardly away from the work so that the bug passes thereunder without digging into the work.

The movement of the tool point may be slight but is sufiicient to overcome any abnormal strain or digging of the point into the metal which produces the roughness that is so objectionable.

As the bug moves past the point, the cutting edges continue with the cutting action.

At the completion of the .cut, the tool and .roll are moved relatively in an opposite direction and the cutting end flexes sufficiently for the cutting edges to slide in the groove without a danger of digging in or scraping so as to result in any rough ness of the work. The flexing of the tool obviates the necessity of clearing the tool from the work as has been usually heretofore necessary.

Altogether it is possible to produce longitudinal grooves in a minimum of time and at a low cost which possesses the desirable characteristics so as to eliminate subsequent final finishing operations.

It will be observed that the tool is so formed that when the cutting point is disposed as described the cutting point may move in opposite directions outwardly and upwardly away from the work.

The invention 'may be embodied in-other spe cific forms without departing from the essential characteristicsthereof. Hence, the present embodiments are therefore to be considered in all respects merely as being illustrative and not as being restrictive. the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all modifications and variations as fall within the meaning and purview and range of equivalency of the appended claims are therefore intended to be embraced therein.

What it is desired to claim and secure by Letters Patent of the United States is:

1. As a new article of manufacture. a unitary tool for forming in an elon ated. cylindrical body circumferentiallv spaced lon itudinal grooves compr sing, an elongated member havin an upper shank portion and a lower cuttin portion. said member having forward and rear sides and said cuttin portion having a lower cuttin point at the forward side of the member. a portion of the member between the shank and cuttin portions formed to provide a cross-sectional area which is relativel less than that of adjacent portions thereof whereby said cutting and shank portions are relativel vieldable. all adapted and arranged whereby with said cuttin point disposed in a plane at ri ht angles relative to the longitudinal axis of a body in which a roove is being formed by the tool the cutting portion may flex in opposite directions so that said cutting point may swing laterally outwardly and upwardly in opposite directions relative to said plane.

2. As a new article of manufacture, a unitary tool for forming circumferentially spaced longitudinal grooves in an elongated cylindrical member by relative longitudinal movements of the member and tool with the tool disposed substantially radially of the member comprising, an elongated relatively rigid body substantially rectangular in cross section having forward and .rear sides, the rear side of said body formed with a V-shaped recess having sides extending upwardly and forwardly from the lower end thereof and thenoutwardly and upwardly providing lower cutting and upper shank portions connected by a portion at the forward side of the body having a cross sectional area which is less than that of said shank portion, and the said cutting portion at the forward lower side thereof provided with a groove forming cutting edge, all adapted and arranged whereby with said tool disposed radially and in the plane of the longitudinal .axis of a cylindrical member and with the cutting edge in engagement therewith as said tool is advanced forwardly longitudinally of said member said cutting edge may move rearwardly and upwardly by flexing of said connecting portion.

3. A unitary tool for forming circumferentially spaced longitudinal grooves 'in an elongated cylindrical member by relative longitudinal movements of the member and tool with the tool .disposed substantially .radially of the member comprising, an elongated relatively rigid body substantially rectangular in cross section having forward and rear sides, the rear side of said body being formed with a v-shaped recess having sides extending upwardly and forwardly from the lower end thereof and then outwardly and upwardly providing lower cutting and upper shank portions connected by a portion at the forward side of said body having a cross sectional area less than that of the shank portion, and the cutting portion being provided with a groove forming cutting edge, all adapted and arranged whereby with the tool disposed radially a cylindrical member and with the cutting edge in engagement therewith as the tool is advanced forwardly longitudinally of the member the cutting edge may move rearwardly and upwardly by a flexing of the connecting portion.

JOHN OAKLEY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Name Date Winkler July 13, 1948 Number 

